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Windows Forms: Full Screen on secondary display problem

Posted on 2009-04-09
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Last Modified: 2013-11-07
Hi,

I've got some .NET windows forms which I am trying to display in full screen mode (i.e. takes up the entire display, start bar and all), yet I"m having difficulties getting it to display on the correct monitor.  

My code looks as per the code snippet attached.  As you can see, I've tried both setting both the Location and the Bounds properties of the form, both of which _appear_ to place the form in the correct position, i.e. its location property becomes 1024,0 in 1024x768 res.  However, when the form is rendered, it still appears on the primary screen.  If I switch the check in the GetSecondaryScreen method to return the primary screen, rather than the secondary, the result is exactly the same; it still fills up the monitor.
public FullScreenForm()
		{
			Screen displayScreen = GetSecondaryScreen();
			if (displayScreen != null)
			{
				// Properties needed for full screen-ness.
				this.MaximizeBox = false;
				this.MinimizeBox = false;
				//this.TopMost = true;
				this.FormBorderStyle = FormBorderStyle.None;
 
				// Place the window in the secondary screen
				this.Size = new System.Drawing.Size(displayScreen.WorkingArea.Width, displayScreen.WorkingArea.Right);
 
				//this.Location = screen.WorkingArea.Location;
				this.Bounds = new System.Drawing.Rectangle(
					displayScreen.WorkingArea.X, displayScreen.WorkingArea.Y, displayScreen.WorkingArea.Width, displayScreen.WorkingArea.Right);
 
			}
		}
 
		private Screen GetSecondaryScreen()
		{
			if (Screen.AllScreens.Length <= 1)
			{
				return null; 
			}
			foreach (Screen screen in Screen.AllScreens)
			{
				if (!screen.Primary)
				{
					return screen;
				}
			}
 
			return null;
		}

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Question by:neotechnology
2 Comments
 
LVL 18

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DarrenD earned 500 total points
ID: 24105538
Hi,

I have two forms that I display on two seperate monitors.

On each form at design time I specify the following:

FormBorderStyle = None
StartPosition = Manual

Then I have a main form which I load the other two forms. I use the following code

  Private Sub ShowForm1()

    MyFrm1.Location = New System.Drawing.Point(20, 100)
    MyFrm1.WindowState = FormWindowState.Maximized
    MyFrm1.ShowDialog()

  End Sub

  Private Sub ShowForm2()

    MyFrm2.Location = New System.Drawing.Point(1500, 100)
    MyFrm2.WindowState = FormWindowState.Maximized
    MyFrm2.ShowDialog()

  End Sub

I know this is VB.NET but I'm sure you get it.

Hope this helps,

Darren
0
 

Author Closing Comment

by:neotechnology
ID: 31568415
Thanks for that, solved my problem.  The hint was that I was trying to set the Location property in the constructor, which was being changed once I called Show() on the form.  I've since created a new method for showing, and set the Location in that before calling Show(), now it works fine.
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